summaryrefslogtreecommitdiff
path: root/src/libsystemd-network/sd-dhcp-server.c
diff options
context:
space:
mode:
authorTom Gundersen <teg@jklm.no>2014-05-24 19:27:20 +0200
committerTom Gundersen <teg@jklm.no>2014-06-13 16:53:13 +0200
commitff734080aa02cd70b13bc0fdeec4a5886166163a (patch)
tree5a9bbea68d09df0ce04719d27ca4dc37b376d3be /src/libsystemd-network/sd-dhcp-server.c
parentb44cd8821087f2afebf85fec5b588f5720a9415c (diff)
sd-dhcp-server: add basic functionality for starting/stopping server
Bind to UDP socket and listen for messages, discarding anything we receive.
Diffstat (limited to 'src/libsystemd-network/sd-dhcp-server.c')
-rw-r--r--src/libsystemd-network/sd-dhcp-server.c89
1 files changed, 89 insertions, 0 deletions
diff --git a/src/libsystemd-network/sd-dhcp-server.c b/src/libsystemd-network/sd-dhcp-server.c
index 885d68d335..a9768f8fa2 100644
--- a/src/libsystemd-network/sd-dhcp-server.c
+++ b/src/libsystemd-network/sd-dhcp-server.c
@@ -20,8 +20,11 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
+#include <sys/ioctl.h>
+
#include "sd-dhcp-server.h"
#include "dhcp-server-internal.h"
+#include "dhcp-internal.h"
sd_dhcp_server *sd_dhcp_server_ref(sd_dhcp_server *server) {
if (server)
@@ -34,6 +37,8 @@ sd_dhcp_server *sd_dhcp_server_unref(sd_dhcp_server *server) {
if (server && REFCNT_DEC(server->n_ref) <= 0) {
log_dhcp_server(server, "UNREF");
+ sd_dhcp_server_stop(server);
+
sd_event_unref(server->event);
free(server);
}
@@ -51,6 +56,7 @@ int sd_dhcp_server_new(sd_dhcp_server **ret) {
return -ENOMEM;
server->n_ref = REFCNT_INIT;
+ server->fd = -1;
*ret = server;
server = NULL;
@@ -90,3 +96,86 @@ sd_event *sd_dhcp_server_get_event(sd_dhcp_server *server) {
return server->event;
}
+
+int sd_dhcp_server_stop(sd_dhcp_server *server) {
+ assert_return(server, -EINVAL);
+
+ server->receive_message =
+ sd_event_source_unref(server->receive_message);
+
+ server->fd = safe_close(server->fd);
+
+ log_dhcp_server(server, "STOPPED");
+
+ return 0;
+}
+
+static int server_receive_message(sd_event_source *s, int fd,
+ uint32_t revents, void *userdata) {
+ _cleanup_free_ uint8_t *message = NULL;
+ sd_dhcp_server *server = userdata;
+ struct iovec iov = {};
+ struct msghdr msg = {
+ .msg_iov = &iov,
+ .msg_iovlen = 1,
+ };
+ int buflen = 0, len, r;
+
+ assert(server);
+
+ r = ioctl(fd, FIONREAD, &buflen);
+ if (r < 0)
+ return r;
+ if (buflen < 0)
+ return -EIO;
+
+ message = malloc0(buflen);
+ if (!message)
+ return -ENOMEM;
+
+ iov.iov_base = message;
+ iov.iov_len = buflen;
+
+ len = recvmsg(fd, &msg, 0);
+ if (len < buflen)
+ return 0;
+
+ log_dhcp_server(server, "received message");
+
+ return 1;
+}
+
+int sd_dhcp_server_start(sd_dhcp_server *server) {
+ int r;
+
+ assert_return(server, -EINVAL);
+ assert_return(server->event, -EINVAL);
+ assert_return(!server->receive_message, -EBUSY);
+ assert_return(server->fd == -1, -EBUSY);
+
+ r = dhcp_network_bind_udp_socket(INADDR_ANY, DHCP_PORT_SERVER);
+ if (r < 0) {
+ sd_dhcp_server_stop(server);
+ return r;
+ }
+ server->fd = r;
+
+ r = sd_event_add_io(server->event, &server->receive_message,
+ server->fd, EPOLLIN,
+ server_receive_message, server);
+ if (r < 0) {
+ sd_dhcp_server_stop(server);
+ return r;
+ }
+
+ r = sd_event_source_set_priority(server->receive_message,
+ server->event_priority);
+ if (r < 0) {
+ sd_dhcp_server_stop(server);
+ return r;
+ }
+
+ log_dhcp_server(server, "STARTED");
+
+ return 0;
+}